diff options
| author | Mark Wielaard <mjw@redhat.com> | 2014-12-12 16:43:04 +0100 |
|---|---|---|
| committer | Mark Wielaard <mjw@redhat.com> | 2014-12-17 16:35:56 +0100 |
| commit | 9202665816763fad8524dd78a664dbcaa157b8d4 (patch) | |
| tree | a895bade664b2701de624f57d5c79a69ebcd7004 /libdw/dwarf_getlocation.c | |
| parent | 274cbda6f5d5b7c57d488edaeb55876ba8705db3 (diff) | |
libdw: Make sure all attributes come with a (fake) CU for bound checks.
All attributes now have a reference to a (fake) CU that has startp and
endp set to the data section where the form data comes from. Use that
for bounds checking in __libdw_form_val_len and dwarf_formblock to make
sure data read doesn't overflow any data section. Remove libdwP.h cu_data
and use cu startp and endp directly where appropriate.
Signed-off-by: Mark Wielaard <mjw@redhat.com>
Diffstat (limited to 'libdw/dwarf_getlocation.c')
| -rw-r--r-- | libdw/dwarf_getlocation.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/libdw/dwarf_getlocation.c b/libdw/dwarf_getlocation.c index 2a4c8906..38e93e68 100644 --- a/libdw/dwarf_getlocation.c +++ b/libdw/dwarf_getlocation.c @@ -555,6 +555,14 @@ static int getlocation (struct Dwarf_CU *cu, const Dwarf_Block *block, Dwarf_Op **llbuf, size_t *listlen, int sec_index) { + /* Empty location expressions don't have any ops to intern. + Note that synthetic empty_cu doesn't have an associated DWARF dbg. */ + if (block->length == 0) + { + *listlen = 0; + return 0; + } + return __libdw_intern_expression (cu->dbg, cu->dbg->other_byte_order, cu->address_size, (cu->version == 2 ? cu->address_size |